Print usage if input parameter is missing

diff --git a/encode.py b/encode.py
index f99230ab3605ced1c22487b3a67f594ba80460dc..57acdfc4c641ae5d8794c01be305fafc5378a5c5 100755 (executable)
--- a/encode.py
+++ b/encode.py
@@ -232,6 +232,8 @@ def parse_args():
                        output = os.path.splitext(os.path.basename(input))[0]
                elif len(args) == 2:
                        input, output = args
+               else:
+                       raise ValueError
        except Exception:
                parser.print_usage()
                sys.exit(1)